D70s 12-24mm shots

This is the first time i used magic filter with the 12-24mm, no flash

I normally use the 10.5 for most of my wideangle/fisheye shots, so i found that the 12-24 lens was quite a hard lens to use, i had some problems acheiving sharpness thorughout the whole picture. Maybe someone can help me with that.

Any comments on the photos would be helpful.

Which dome were you using and were you using a diopter?

David

Corner sharpness with the 12-24mm is always something of a domeport and dioptre lottery. And I have found during the workshops I run that many manufacturers recommend not using a dioptre. And the people following that recommendation are disappointed with corner sharpness. Then during the workshop I have leant them a dioptre and wow, suddenly corner sharpness is much improved.

The other problem that you may have here is that you are probably using a reasonable wide aperture (e.g. F5.6) and the 12-24mm will always struggle to produce decent corner sharpness when it is wider than F8 underwater.

Alex

I was using the 8 inch dome port and no i wasnt using a diopter.

Alex, thanks for the tip. The pictures were taken with F22. So what could be the case? Maybe i should add a diopter and give that a try.

F22?! Are you sure? With a filter and no strobe at F22 to get bright shots you must have had a very long shutter speed. Maybe you had it at ISO 3200? Most of my strobe shots are at f8 and 1/250 - 1/125 ISO 200. Could you check the XEIF?

To change the subject. What happened to all the fish on that reef?!

Alex

I like the third image very much.

There is some problem (maybe my side but I can't see the first two images)

Its wheeler reef off the coast of townsville in northern queensland. Fish, i don't know, i didn't see that many on the dives i did that day. Very dissappointing. Sorry about the first two , it worked for a while, if you would like, you can see it at http://tonyliuliu.blogspot.com cheers.